Separator



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` U'IVENTORS William )2r/idf 1 Y B'y -Hrllm fewsfn/ ec. 25, 1945. w. D.YERRlcK ETAL SEPARATOR Filed June 2, 1944 5 Sheets-Sheet 2 ABY ec. 5,M45. w. D. YERRICK ETAL 2,39L534 SEPARATOR Filed June 2, 1944 5Sheets--SheerI 3 Z'arney Patented Dec. 25, 1945 SEPARATOR William D.Yerrick and Arthur Jensen, Wellsville,

N. Y., assignors to The Air Preheater Corporation, New York, N. Y.

Application June 2, 1944, Serial No. 538,402

3 Claims. (Cl. 18S-57) The present invention relates to materialseparating apparatus and particularly to improvements in apparatusespecially adapted for ltering ne particles from a gaseous iluid.

The invention is directed to a filter for recovering valuable catalyticmaterial from a gas stream and utilizes apparatus of the type in whichdust-laden gases pass through a chamber containing porous filteringtubes on the walls of which the dust is disentrained. In iiltering veryviine particles from gases, the filtering elements tend to become cloggedquickly and usually it is necessary to remove the apparatus from servicefor cleaning. The present invention contemplates an improved apparatusfor continuously and eiiciently cleaning iine particles of material fromthe lter tubes of such apparatus without taking the entire apparatus outof use.

The invention will be best understood upon consideration of thefollowing detailed description of illustrative embodiments thereof whenread in conjunction with the accompanying drawings in which:

Figure 1 is a sectional elevation of a dust separater embodying thepresent invention;

Fig. 2 is an enlarged view of the upper part of the apparatus shown inFig. 1.

Figure 3 is a transverse sectional view on the correspondinglydesignated section line in Figure 2.

Fig. 4 is a fragmentary plan view of the separator with parts brokenaway to illustrate details of construction.

Figure 5 is an elevational view similar to Figure 1 of a modied form ofapparatus and Figure 6 is a Isectional view on the line 6 8 in Figure 5.

The dust separator comprises a housing I cylindrical in form to whichdust-laden gasis admitted through a tangentially located inlet II to bedeflected around the casing by contact with a frusto-conical balile I2located opposite the inlet and attached to the inner wall of casing I0above the inlet. Below the inlet II the walls of the housing I@ convergeto form a dust hopper. Near the upper end of casing III a transversepartition I3 is formed with a plurality of apertures providing seats foriilter tubes I4, a number of which depend into the lower part of each ofa number of compartments I formed by radial diaphragms I6 extending fromadjacent baille I2 to the base of a centrally located neck portion I'Iin the side oi' which the outlet I8 for clean gases is formed. 'I'hefilter tubes have porous walls for separating the dust from the gases asthe latter pass into the center of the tubes through their walls to owfrom their open upper ends into the parts of compartments I5 above thepartition I3, the lower ends of these tubes being closed.

As dust-laden gases enter the housing Ill through the tangential inletII they strike against the baille I2 which by deilecting them slows themdown and also causes them to change their direction since they must flowaround the lower edge of the baille in their travel to the lter tubesI4. The larger particles of material are disentrained from the gases bythe changes in velocity and direction and fall into the dust hopper.Rising within the casing I0 at reduced velocity the gases pass throughthe walls of the porous lter tubes I4 and the ner particles aredisentrained by these tubes so that the clean gases flow from the upperends in the tubes into the space above the partition I3 to be dischargedfrom the separator through the clean gas outlet I8.

As is shown in Figs. 3 and 4 a ported partition or seal plate 20 ismounted at the upper ends of the diaphragms I B and is formed with aplurality of ports 2| each alining with one of the various compartmentsI5 formed thereby, Mounted for rotation on the seal plate 20 about thevertical axis of the housing is a nozzle head 22 having a -port 23adapted to aline in succession with the various ports 2I in the sealingring 20 for admitting blow-back gas into the particular compartmentopposite the nozzle 22. The blow-back gas is supplied to the nozzle 22through a conduit 24 extending through the side wall of the housing Illand upwardly to connect with a central opening 25 in seal plate 20 thatregisters continuously with port 26 at the inner end of the duct 2l inthe nozzle head. The nozzle 22 has lateral apron-like extensions 28which obscure the ports 2l leading to the two compartments at eitherside of that with which its discharge port 23 is in registration. Thesewith sealing strips and rings 36, 3l conilne the blow-back to the ltertubes of a single compartment. Connected to the nozzle 22 and projectingthrough the top of the housing is a shaft 32 driven by a motor 33through a speed reducer 34 for slowly rotating the nozzle 22 about theaxis of the housing to register successively with the variouscompartments so that clean blow-back gas at a pressure higher than thedust laden gas may be directed through the filter tubes I4 in eachcompartment I 5 in succession. While the tubes in any compartment arebeing cleaned the remainder of the tubes except for those in the twocompartments immediately adjacent the nozzle remain effective for thefiltering purposes since the dust-laden gas continues to flow throughthe latter.

In the form shown in Figs. 5 and 6 a shut-off valve 40 provided in thesupply pipe 24 for the clean blow-back gas is automatically closed whena hydraulic motor 4I periodically lifts the nozzle head 22 andoperatively connects it to a continuously rotating clutch part 42 sothat it may be turned to register with another compartment. By operatinga motor 43, the valve 40 and the control for hydraulic motor 4| inproper synchronized relation through a fluid distributing valve 44operated by a cam 45 on drive shaft 46 the supply of blow-back gas iscut off during the time that the cleaning nozzle 22 is raised and beingmoved from registration with one compartment to the next. With this formit is unnecessary to cover the upper ends of compartments at either sideof the nozzle head 22 because the arrangement for shutting off thesupply of blow-back gas assures that it will be blown into onecompartment at a time.. Inasmuch as this arrangement does not requirethat a compartment at eachkside of that being blown back also be placedout of operation so far as filtering is concerned, it will be seen thatto handle a predetermined volume of dust-laden gas a fewer number voffilter tubes are required and therefore the size of the apparatus may bereduced.

What we claim is:

l. Dust filtering apparatus comprising; a casing formed with an inletfor dust laden gas and a clean gas outlet spaced axially of the casingfrom said inlet; means forming a dust hopper at the bottom of saidcasing; partition means extending across said casing intermediate saidgas inlet and outlet and formed with a plurality of aperturesdistributed substantially uniformly of said partition means; a pluralityof porous-.walled filter tubes seated in said openings for disentrainingdust from gases flowing through the walls of said tubes; a cleaningnozzle having a fluid port facing and adapted to alinewith correspondingends of each of a group of adjacent tubes; means for supplying acleaning fluid to said nozzle; means for moving said nozzle axially ofsaid housing to and from a position with respect to the ends of saidfilter tubes wherein the cleaning fluid is confined to the tubes alinedwith the nozzle port; means for periodically moving said nozzle fromsaid p0- sition and traversing it with respect to said partition meansfor alinement withanother group of tubes; and valve means operative uponmovement of said nozzle for discontinuing the supply of fluid thereto.

2. Dust filtering apparatus comprising; a casing formed with an inletfor dust laden gas and a clean gas outlet spaced axially of the casingfrom .said inlet; means forming a dust hopper at the bottom of saidcasing; radial diaphragms extending axially of said casing intermediatesaid inlet and outlet and terminating short of the latter for formingcompartments in said casing; filtering means in said compartments; acleaning nozzle disposed above the upper ends of said diaphragms andhaving a fluid port adapted to aline with said compartmentssuccessively; means for supplying a cleaning fiuid to said nozzle;cooperative sealing means associated with the upper ends of saiddiaphragms and said nozzle for confining fluid to the compartment alinedwith said nozzle; means for moving said nozzle axially of said housingto and from a position with respect to the ends of said compartmentswherein the cleaning fiuid is confined to a compartment alined with thenozzle port; means for periodically moving said nozzle from saidposition and moving it about the axis of said casing irrto alinementwith another compartment; and valve means operative upon movement ofsaid nozzle for discontinuing the supply of fiuid thereto.

3. Fluid treating apparatus comprising; a casing formed with fluid inletand outlet connections spaced axially thereof; radial diaphragmsextending axially of said housing intermediate said inlet and outlet andterminating short of the latter for forming compartments in saidhousing; means in said compartments for contact by fluid flowing betweensaid inlet and outlet; a nozzle member disposed above the upper ends ofsaid diaphragms and having a fluid port adapted to aline with saidcompartments successively; means for supplying a fiuid to said nozzle;cooperative sealing means associated with the upper ends of saiddiaphragms and said nozzle for confining its fluid tothe compartmentalined therewith; means for moving said nozzle axially of said housingto and from a position with respect to the ends of said compartmentswherein its fluid is confined to a compartment alined with the nozzleport; means for periodically moving said nozzle from said position andtraversing it with respect to said partition means into alinement withanother compartment; and valve means operative upon movement of saidnozzle for discontinuing the supply of fluid thereto.

WILLIAM D. YERRICK. ARTHUR JENSEN.

